1、The effect of processing/curing temperature and viscosity of epoxy

We hypothesized that the use of epoxy resins at high temperatures leads to an extreme decrease in resin surface tension and viscosity of epoxy, which would cause re-aggregation of graphene once dispersed.

2、Low viscosity and low temperature curing reactive POSS/epoxy hybrid

Herein, in order to satisfy the practical requirements in production to cure at low temperatures and develop a new high-temperature resistant and high toughness epoxy, this study firstly determined a low viscosity and low-temperature curable (Tcuring ≤ 100 °C) epoxy resin system (E-51/MHHPA/DMBA).

3、Influence of different composite curing agents on the rapid curing

In particular, effective formulations are designed for mixing fast and slow curing agents, studying their effects on the curing behavior, curing quality, and mechanical properties of epoxy resins and elucidating their influence mechanisms.

4、Effect of Curing Agent and Temperature on the Rheological Behavior of

The effect of curing agent (6610) content and temperature on the rheological behavior of the epoxy resin CYD-128 was studied by DSC analysis and viscosity experiments.

5、Investigation of the Curing Kinetics and Rheological Behavior of

The curing reactivity and viscosity of AG-70 epoxy resin system with MNA as the curing agent and 2, 4-EMI as the accelerator promoter were measured by using non-isothermal differential scanning calorimetry (DSC) and RS600 Rotational Rheometer, respectively.

Effect of Curing Agent Type on Curing Reaction Kinetics of Epoxy Resin

In this paper, low molecular weight polyamides, aromatic amines and anhydrides were selected as three kinds of curing agents and their isothermal viscosity-time properties were studied to...

Modeling the Effect of the Curing Conversion on the Dynamic Viscosity

ABSTRACT: Published curing profiles of epoxy resins mixed with an anhydride curing agent and subsequently crosslinked were reanalyzed with a modified sigmoidal model to describe the dynamic viscosity accompanying resin curing.

Preparation of Low

In this work, a low-shrinkage, high-strength epoxy resin plugging agent was prepared based on a low-viscosity petroleum-based epoxy resin, and the curing agent and accelerator dosage were optimized, and the performance of injectable, mechanical, adhesion, and plugging was evaluated.

Cure kinetics and viscosity modelling of a high

For rapid heating rates between 8 and 15 °C/min, the value of minimum viscosity remains on a similar level, as the advancement in degree of cure captured in Equation (7) is the dominant viscosity controlling factor over the viscosity decreasing temperature effect in the process.

Surface Chemistry and Molecular Dynamics of Epoxy Resin

In this study, we investigate the main reactions occurring on the surface of DEGBA/DEGBF epoxy resin following curing, post-curing, and thermal post-curing processes using Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS).

In modern industrial manufacturing, epoxy curing agents serve as a critical bond between materials and structures, with their performance directly impacting the quality of the final product. during the transition from liquid to solid, changes in viscosity are a non-negligible physical phenomenon. This article explores how epoxy curing agents become viscous, analyzes the scientific principles behind this transformation, and discusses its practical implications.

Viscosity Change: A Key Parameter in the Liquid-to-Solid Transition Viscosity, a measure of fluid flow resistance, reflects the material’s flow properties. For epoxy curing agents, viscosity variations during preparation and use affect not only processing performance but also the mechanical strength and durability of the final product.

Factors Influencing Viscosity Temperature, curing time, curing agent type, and dosage all influence viscosity. At room temperature, epoxy curing agents typically remain liquid with moderate flowability. As curing progresses, cross-linking and polymerization reactions enhance molecular interactions, gradually increasing viscosity. This change marks the transition from liquid to solid and results from the curing reaction.

Mechanism Behind Viscosity Increase The curing process involves an addition reaction between epoxy compounds and active hydrogen atoms, forming stable cross-linked polymers. This reaction releases heat, accelerating the process. As unreacted solvents and small molecules exit, large polymers intertwine to create a denser structure, driving up viscosity.

Role of Curing Agents The type and amount of curing agent significantly affect viscosity. Different curing agents have unique chemical structures and functional groups, influencing reaction rates and mechanisms. Overdosing may lead to excessive cross-linking and overly high viscosity, while insufficient dosage could result in incomplete curing and compromised performance.

Practical Implications Understanding viscosity changes is vital for optimizing production processes. By controlling parameters like temperature, time, and curing agent dosage, viscosity can be precisely regulated to ensure proper curing. This improves efficiency, reduces defects, and enhances product quality.

Advancing Material Innovation Studying viscosity dynamics also supports the development of new materials. Deeper insights into thermodynamic and kinetic behaviors during curing can guide the creation of high-performance epoxy systems.

Viscosity changes in epoxy curing agents involve complex interactions of multiple factors. Mastering these principles is essential for optimizing manufacturing, improving product standards, and driving innovation. Future research aims to uncover deeper laws governing viscosity to provide robust theoretical and technical support for industrial advancements.